Notebook[List[Cell[BoxData[FormBox[RowBox[List[RowBox[List[SubscriptBox["\[CurlyPhi]", "n"], "=", RowBox[List[FractionBox[RowBox[List["4", " ", "\[Pi]"]], "\[Lambda]"], SubscriptBox["d", "n"]]]]], ","]], TraditionalForm]], "Input"]]]